The drumheads are hydraulic forged at a single heat, the manhole opening and stiffening ring being forged in position. Flat raised seats for water column and feed connections are formed in the forging.
All heads are provided with manholes, the edges of which are turned true. The manhole plates are of forged steel and turned to fit manhole opening. These plates are held in position by forged-steel guards and bolts.
Forged-steel Drum Nozzle
The drum nozzles are of forged steel, faced, and fitted with taper thread stud bolts.
Cross boxes by means of which the sections are attached to the drums, are of forged steel, made from a single sheet.
Forged-steel Cross Box
Where two or more drums are used in one boiler they are connected by a cross pipe having a flanged outlet for the steam connection.